Yep, on-court interview after his 2nd or 3rd match I think.
He said he liked it because he already had had many other colors. He also said the pink shirt a few years ago sold pretty good.
Personally...

I think the people who don't like Djoko ripping his shirt tried it themselves and failed.
I actually saw that happening ones last year :D. A guy lost and he tried to rip his shirt but the only thing...